Thermal neutrons can cause fission in
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(a) |
(b) |
(c) |
(d) |
Thermal neutrons can cause fission in
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(a) |
(b) |
(c) |
(d) |
(a)
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At the time of total solar eclipse, the spectrum of solar radiation would be
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(a) A large number of dark Fraunhofer lines |
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(b) A less number of dark Fraunhofer lines |
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(c) No lines at all |
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(d) All Fraunhofer lines changed into brilliant colours |
In a step-up transformer the turn ratio is 1:10. A resistance of 200 ohm connected across the secondary is drawing a current of 0.5 A. What is the primary voltage and current
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(a) 50 V, 1 amp |
(b) 10 V, 5 amp |
(c) 25 V, 4 amp |
(d) 20 V, 2 amp |
The neutral temperature of a thermocouple is 350℃ when the cold junction is at 0℃ When the cold junction is immersed in a bath of 30℃, the inversion temperature is
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(a) 700℃ |
(b) 600℃ |
(c) 350℃ |
(d) 670℃ |
$\text{y}=\text{a}_1\sin\omega\text{t}$
$\text{y}=\text{a}_2\sin(\omega\text{t}+\in)$
$\text{y}=\text{a}_1\sin2\omega\text{t}$
$\text{y}=\text{a}_2\sin2(\omega\text{t}+\in)$
As a result of interference of two coherent sources of light, energy is
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(a) Increased |
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(b) Redistributed and the distribution does not vary with time |
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(c) Decreased |
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(d) Redistributed and the distribution changes with time |
Two identical heaters rated 220 volt, 1000 watt are placed in series with each other across 220 volt lines. If resistance do not change with temperature, then the combined power is
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(a) 1000 watt |
(b) 2000 watt |
(c) 500 watt |
(d) 4000 watt |
The cold junction of a thermocouple is maintained at 10℃. No thermo e.m.f. is developed when the hot junction is maintained at 530 ℃ . The neutral temperature is
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(a) 260℃ |
(b) 270℃ |
(c) 265℃ |
(d) 520℃ |